Visual Fault Locator Kit - Includes: VFL-25 2 AAA Batteries VFL-25125 FC/LC Adapter. This pen style VFL is specially designed for field personnel who need a portable light source tool for fiber tracing fiber routing continuity testing to locate breakpoints (bending or cracking in fiber optic cables) and poor connections. VFL-150 works on FC SC ST connectors and will work on LC connectors when used with the included VFL-25125 adapter. The VFL works in an OTDR dead zone and is used for end-to-end visual fiber identification. Operates in either CW (continuous wave) or pulsed mode. Not recommended For use on dark colored or armored cables.TECHNICAL SPECIFICATIONS Light Source: Class IIIA Laser Diode < 5mw. Wavelength: 650nm. Distance: Up to 5km (3.10 miles) Battery Life: 60 Hours. Connector: 2.5mm universal. Working Temperature: -4F (-20C) to 140F (60C). Storage Temperature: -40F (-40C) to 185F (85C). Power: 2 AAA Batteries.